.content img {
  width: 100%;
}
.content .first_btn {
  background: url(http://oor4c3c8g.bkt.clouddn.com/zxlj.gif) no-repeat;
  background-size: 100% 100%;
  height: 1.55rem;
  width: 100%;
}
.content .sec_btn {
  background: url(http://oor4c3c8g.bkt.clouddn.com/ljzxjg.gif) no-repeat;
  background-size: 100% 100%;
  height: 1.55rem;
  width: 100%;
}
.content .three_btn {
  background: url(http://oor4c3c8g.bkt.clouddn.com/yyzj.gif) no-repeat;
  background-size: 100% 100%;
  height: 1.55rem;
  width: 100%;
}